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ISL6535CBZ Datasheet(PDF) 5 Page - Intersil Corporation

Part # ISL6535CBZ
Description  Synchronous Buck Pulse-Width Modulator PWM Controller
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL6535CBZ Datasheet(HTML) 5 Page - Intersil Corporation

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5
FN9255.0
January 17, 2006
Functional Pin Description (SOIC/QFN)
RT (Pin 1/14)
This pin provides oscillator switching frequency adjustment.
By placing a resistor (RRT) from this pin to GND, the
switching frequency is set from between 200kHz and
1.5MHz according to the following equation: .
Alternately ISL6535’s switching frequency can be lowered
from 200kHz to 50kHz by connecting the RT pin with a
resistor to VCC according to the following equation:
REFERENCE
Reference Voltage
TJ = 0°C to 70°C
0.591
0.597
0.603
V
TJ = -40°C to 85°C
0.588
0.597
0.606
V
System Accuracy
TJ = 0°C to 70°C
-1.0
-
1.0
%
TJ = -40°C to 85°C
-1.5
-
1.5
%
REFIN Current Source (QFN Only)
-4
-6
-8
µA
REFIN Threshold (QFN Only)
2.10
-
3.50
V
REFIN Offset (QFN Only)
-3
-
3
mV
GATE DRIVERS
Upper Drive Source Current
IU_SOURCE VBOOT - VPHASE = 12V, 3nF Load - GBD
-
1.25
-
A
Upper Drive Source Impedance
RU_SOURCE 90mA Source Current
-
2.0
-
Upper Drive Sink Current
IU_SINK
VBOOT - VPHASE = 12V, 3nF Load- GBD
-
2
-
A
Upper Drive Sink Impedance
RU_SINK
90mA Source Current
-
1.3
-
Lower Drive Source Current
IL_SOURCE VPVCC = 12V, 3nF Load - GBD
-
2
-
A
Lower Drive Source Impedance
RL_SOURCE 90mA Source Current
-
1.3
-
Lower Drive Sink Current
IL_SINK
VPVCC = 12V, 3nF Load - GBD
-
3
-
A
Lower Drive Sink Impedance
RL_SINK
90mA Source Current
-
0.94
-
SSDONE (QFN ONLY)
SSDONE Low Output Voltage
ISSDONE = 2mA
0.30
V
Electrical Specifications
Recommended Operating Conditions, unless otherwise noted specifications in bold are valid for process,
temperature, and line operating conditions. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Typical Performance Curves
FIGURE 1. RRT RESISTANCE vs FREQUENCY
FIGURE 2. BIAS SUPPLY CURRENT vs FREQUENCY
10
100
1000
SWITCHING FREQUENCY (kHz)
10
100
1000
RRT PULLUP
TO +12V
RRT PULLDOWN
TO GND
100
200
300
400
500
600
700
800
900
1000
80
70
60
50
40
30
20
10
0
SWITCHING FREQUENCY (kHz)
CGATE = 1000pF
CGATE = 3300pF
CGATE = 10pF
R
RT kΩ
[]
6500
F
s kHz
[] 200 kHz
[]
------------------------------------------------------- 1.3k
(RRT to GND)
R
RT kΩ
[]
55000
200 kHz
[] F
s kHz
[]
------------------------------------------------------- 70k
+
(RRT to VCC)
ISL6535


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